Impinging Atomization Enhanced by Microjet Injection - effect, mechanism and optimization -

Droplet size and velocity characteristics of water-air impinging jet atomizer

“…In this case of primary breakup, the liquid membranes deform into bags, which subsequently break into small droplets, while the surrounding ligaments break into larger droplets. These phenomena were also observed by Inoue et al (2013) who referred to them as bursting bulging portions and at similar air to liquid mass flow rate ratios around 2-3%. Fiber type ligaments (Lasheras et al 1998) were also observed for the cases of Q L =200 mL/min, and Q L =300 mL/min at Q m =13.50 g/min.…”

“…The details of the break up mode in the vicinity of the impingement point have not been described since the photographs were taken from a large distance. Additional research on the configuration studied by Avulapati and Venkata (2013) was carried out by Inoue et al (2013). Atomization of liquid-air-liquid impinging jets was recorded using a high speed camera for visualization and a combination of CCD camera and pulsed YAG laser was utilized for droplet size measurement.…”

Spray characteristics of free air-on-water impinging jets

“…is the liquid mass flow rate, d l is the liquid jet diameter, σ is the surface tension between interface liquid and gas, and ν l is the kinematic viscosity of liquid. The specific use of the gas velocity at impingement as used by Inoue et al (2013), would remove influence of the pre-impingement length L to make the present results based on one single value of L = 10 mm independent of it and thus more general.…”

“…The need for improved combustion control has motivated the development of different atomizer configurations to acquire better atomization with high rates of mixing and surface area of liquid fuels, among which twin-fluid atomizers have attracted particular attention since they can lead to satisfactory atomization with relative slow moving liquid (Lefebvre 1988). Numerous studies on various designs of twin-fluid atomizers have been conducted in an effort to derive better understanding of the atomizers' performance and resulting spray characteristics, such as effervescent atomizer (Sovani, et al 2001, Jedelsky, et al 2009, Gomez, et al 2011, air-blast atomizer (Chigier and Farago 1992;Engelbert, et al 1995;Lasheras and Hopfinger 2000;Strasser and Battaglia 2017), air-assist atomizer (Avulapati and Venkata 2013;Inoue, et al 2013;Avulapati and Ravikrishna 2015;Xia, et al 2017), flow blurring atomizer (Gañán-Calvo 2005;Simmons andAgrawal 2010, Jiang, et al 2014;Niguse and Agrawal 2016;), liquid jet in cross flow (Lubarsky, et al 2012, Kourmatzis and Masri 2015, Jadidi, et al 2016.…”

Fundamental Combustion Characteristics of Ethanol/Liquid Oxygen Rocket Engine Combustor with Planar Pintle-type Injector

“…8) Regarding impinging injector, a number of studies have been conducted, and the fundamental mechanism of the atomization process 9) and the effect of several parameters have been researched. [10][11][12] Recently, new propellant injection systems have been proposed such as impinging injector with micro jet injection, 13,14) a gas-centered coaxial system 15) and a porous injector used in combustion test with GH 2 /LOX and GCH 4 / LOX. 16) The number of studies on the pintle injector is much lower than on other injectors such as the coaxial and impinging injectors.…”